Research On Moving Mold Advanced Pultrusion Technology Of Composite Halflenticular Tube

Composite lenticular tube is a basic form of spatial deployable structure, the way to manufacture ultra-long high-accuracy half lenticular tubes is the key technology. Currently in the country and abroad some researchers have launched some related study. Mainly use autoclave molding process technology or oven curing process technology to manufacture the half lenticular tubes. But restricted in many ways related equipment size, technical conditions and the actual production costs, it’s hard to manufacture the half lenticular tube with the length of over 20 meters. Aiming at astronautic composite lenticular tubes in this research, a new method to manufacture the half lenticular tube was proposed. The movable mold advanced pultrusion technique. The main contents are as follows:First of all, this paper proposed the process scheme of MMADP. By means of continuous hot cured the prepreg, reverse pultruded to prepare the long half lenticular tube. Constructed the pultrusion system. The MMADP system includes unreeling device, hot-pressing device, clamping device, temperature control device and motion control device. This work planed and designed the electrical control system. Selected the Siemens S7-200 PLC as the control center. This work designed two kinds of control system mode-one is manual and the other is automatic. Using PLC + servo motor to achieve the motion displacement and velocity control for the hot-pressing device. Designed the touch-screen process as pultrusion system man-machine interface. Intelligent instrument and solid-state relay were selected for temperature control.Then in order to explore the curing kinetics of resin matrix, DSC tests were used. By analyzing the dates, the temperature platforms of advanced pultrusion were selected: preheating at 148℃, curing at 160℃, post-processing at 172℃. Considering the actual situation, the parameters that curing at 160℃ for 20 minutes were optimized.This paper applied the debugging test to ensure that the control system and equipment were running well. Half lenticular tubes were trial manufactured by MMADP. But the surface quality was poor. Improvement measures were raised after analyzing the courses. Use the soft/hard mold to supplied uniform pressure. The surface quality of the half lenticular tubes has big improvement by the new scheme.